公开(公告)号：US20180138818A1

公开(公告)日：2018-05-17

申请号：US15809595

申请日：2017-11-10

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Ta-Yung Yang ,  Tzu-Chen Lin ,  Bing Zeng ,  Li-Di Luo

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M3/33592

Abstract: A flyback power converter includes a transformer, a power switch, a power switch control circuit, a synchronous rectification (SR) switch, an SR switch control circuit, and a signal coupler circuit. The signal coupler circuit includes a primary port and a secondary port, wherein the primary port is electrically connected to the power switch control circuit, and the secondary port is electrically connected to the SR switch control circuit. The primary port and the secondary port receive different signals generated by the power switch control circuit and the SR switch control circuit respectively, and the signal coupler circuit senses and converts the different signals to generate corresponding converted signals at the secondary port and the primary port respectively in different and non-overlapping time periods, without direct contact or direct connection between the primary side and the secondary side of the transformer.

公开(公告)号：US12272592B2

公开(公告)日：2025-04-08

申请号：US18664656

申请日：2024-05-15

Applicant: Richtek Technology Corporation

Inventor： Kun-Huang Yu ,  Chien-Yu Chen ,  Ting-Wei Liao ,  Chih-Wen Hsiung ,  Chun-Lung Chang ,  Kuo-Chin Chiu ,  Wu-Te Weng ,  Chien-Wei Chiu ,  Yong-Zhong Hu ,  Ta-Yung Yang

IPC: H01L21/762 ,  H10D30/65 ,  H10D62/10 ,  H10D64/27

Abstract: A high voltage device includes: a semiconductor layer, a well, a bulk region, a gate, a source, and a drain. The bulk region is formed in the semiconductor layer and contacts the well region along a channel direction. A portion of the bulk region is vertically below and in contact with the gate, to provide an inversion region of the high voltage device when the high voltage device is in conductive operation. A portion of the well lies between the bulk region and the drain, to separate the bulk region from the drain. A first concentration peak region of an impurities doping profile of the bulk region is vertically below and in contact with the source. A concentration of a second conductivity type impurities of the first concentration peak region is higher than that of other regions in the bulk region.

公开(公告)号：US12199506B2

公开(公告)日：2025-01-14

申请号：US18312512

申请日：2023-05-04

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang ,  Wei-Hsu Chang

IPC: H02M3/07 ,  H02M1/00 ,  H02M3/158

Abstract: A switched capacitor voltage converter circuit for converting a first voltage to a second voltage includes: an output capacitor; a switched capacitor converter; and a control circuit. The switched capacitor converter includes: a switch circuit including fourth switches; an inductor coupled between the switch circuit and the output capacitor; and a flying capacitor coupled to the switch circuit, wherein the flying capacitor and the output capacitor constitute a voltage divider. The control circuit generates a PWM signal according to the second voltage and generates switch signals according to the PWM signal to control the switch circuit, so as to convert the first voltage to the second voltage. The control circuit decides whether the switched capacitor converter operates in a boundary conduction mode, a discontinuous conduction mode or a continuous conduction mode according to an output current or an output current related signal.

公开(公告)号：US20240372467A1

公开(公告)日：2024-11-07

申请号：US18637432

申请日：2024-04-16

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang

IPC: H02M3/07 ,  H02M1/38

Abstract: A multi-phase conversion circuit includes: a first and a second sub-conversion circuits; multiple switching signals control the first front switch-mode capacitor conversion circuit's first front capacitor and the first rear switch-mode capacitor conversion circuit's first rear capacitor, and the second front switch-mode capacitor conversion circuit's second front capacitor and the second rear switch-mode capacitor conversion circuit's second rear capacitor to switch between plural electrical connection states. This setup performs switched capacitor voltage division on the first voltage, selectively switching the first or second switching node between the first or second divided voltage derived from the switched capacitor voltage division and a reference potential, whereby performing power conversion between the first power node and the second power node.

公开(公告)号：US12136876B2

公开(公告)日：2024-11-05

申请号：US18065205

申请日：2022-12-13

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang

IPC: H02M3/07 ,  H02M1/00 ,  H02M3/158

Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter, a control circuit and a zero current estimation circuit. The switched capacitor converter includes at least one resonant capacitor, switches and at least one inductor. The zero current estimation circuit is coupled to the at least one inductor and/or the at least one resonant capacitor, for estimating a time point at which a first resonant current is zero during a first process and/or a time point at which a second resonant current is zero during a second process according to a voltage difference between two ends of the inductor, and/or a voltage difference between two ends of the resonant capacitor, to a generate a zero current estimation signal accordingly for generating the operation signal.

公开(公告)号：US12136875B2

公开(公告)日：2024-11-05

申请号：US18049622

申请日：2022-10-25

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang

IPC: H02M3/07 ,  H02M1/00 ,  H02M3/00

Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter and a control circuit. In a charging process of a resonant operation mode, the switches in the switched capacitor converter operate to form a series connection of at least one capacitor and an inductor between a first voltage and a second voltage, as a charging path. In a discharging process of the resonant operation mode, the switches operate to form a series connection of each capacitor and the inductor between the second voltage and a ground level, thus forming plural discharging paths simultaneously or sequentially. In an inductor switching mode, the switches operate to couple one end of the inductor to the first voltage or the ground level alternatingly. The control circuit decides to operate in the resonant operation mode or the inductor switching mode according to the first voltage, thereby maintaining the second voltage within a predetermined range.

公开(公告)号：US20240297568A1

公开(公告)日：2024-09-05

申请号：US18458996

申请日：2023-08-30

Applicant: Richtek Technology Corporation

Inventor： Ta-Yung Yang ,  Chao-Chi Chen ,  Yu-Chang Chen ,  Syuan-Zong Lan ,  Yi-Ju Lu

IPC: H02M1/00 ,  G05F1/56 ,  H02M3/335

CPC classification number: H02M1/0045 ,  G05F1/56 ,  H02M3/33507

Abstract: A voltage regulator for converting an input voltage to an output voltage includes: a first and a second high-side switch, a first and a second low-side switch and a control terminal which is for generating a reference voltage or determining a forced pass-through mode. The output voltage is determined according to the reference voltage during a buck mode and a boost mode. When the input voltage is higher than a first threshold, the voltage regulator is operated in the buck mode. When the input voltage is lower than a second threshold, the voltage regulator is operated in the boost mode. When the input voltage is lower than the first threshold and is higher than the second threshold, the voltage regulator is operated in a pass-through mode. When a voltage of the control terminal is lower than a third threshold, the voltage regulator is operated in the forced pass-through mode.

公开(公告)号：US20240223086A1

公开(公告)日：2024-07-04

申请号：US18471266

申请日：2023-09-20

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang

IPC: H02M3/158 ,  H02M1/00 ,  H02M3/07

CPC classification number: H02M3/1582 ,  H02M1/0009 ,  H02M1/0058 ,  H02M3/07

Abstract: A buck-boost switching converter for converting the power between a first and a second voltage, includes: a first sub-converter coupled between the first voltage and a first switching node, which includes a first plural switches and a capacitor; and a second sub-converter coupled between the second voltage and a second switching node, which includes a second plural switches. The first and second plural switches switch the capacitor and an inductor periodically, so as to divide the first voltage using the capacitor by a switched-capacitor (SC) voltage division method, and to switch the first switching node between a reference voltage and a voltage division of the first voltage, and to switch the second switching node between at least two voltages. The reference voltage is the first voltage, a ground or another voltage division of the first voltage. One of the at least two voltages is related to the second voltage.

公开(公告)号：US20240072633A1

公开(公告)日：2024-02-29

申请号：US18449182

申请日：2023-08-14

Applicant: Richtek Technology Corporation

Inventor： Kuo-Chi Liu ,  Ta-Yung Yang ,  Wei-Hsu Chang ,  Chao-Chi Chen

IPC: H02M1/00 ,  H02M3/07

CPC classification number: H02M1/0058 ,  H02M1/0009 ,  H02M3/07

Abstract: The present invention provides a resonant switched capacitor voltage converter (RSCC), which is coupled to and operates synchronously with another RSCC. The RSCC includes: plural switches, a resonant inductor, a resonant capacitor, and a control circuit. The control circuit controls the switches, so that the resonant capacitor and the resonant inductor are connected in series to each other, to perform resonant operation in a switching period, thus converting an input voltage to an output voltage. The control circuit generates a zero current signal and a first synchronization signal when a resonant inductor current flowing through the resonant inductor is zero. The control circuit turns off at least one corresponding switch according to the zero current signal. The control circuit turns on at least one corresponding switch according to the zero-current signal and a second synchronization signal, so that the RSCC operates in synchronization with at least another RSCC.

公开(公告)号：US11876453B2

公开(公告)日：2024-01-16

申请号：US17560761

申请日：2021-12-23

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Ting-Wei Liao ,  Chien-Yu Chen ,  Kun-Huang Yu ,  Chien-Wei Chiu ,  Ta-Yung Yang

IPC: H02M3/158 ,  H02M1/38

CPC classification number: H02M3/158 ,  H02M1/385

Abstract: A switching converter circuit, which switches one terminal of an inductor to different voltages, includes a high side MOSFET, a low side MOSFET, and a driver circuit which includes a high side driver, a low side driver, and a dead time control circuit. According to an output current, The dead time control circuit adaptively delays a low side driving signal to generate a high side enable signal for enabling the high side driver to generate a high side driving signal according to a pulse width modulation (PWM) signal; and/or adaptively delays the high side driving signal to generate a low side enable signal for enabling the low side driver to generate the low side driving signal according to the PWM signal, so as to adaptively control a dead time in which the high side MOSFET and the low side MOSFET are both not conductive.